The gateway drug effect is a comprehensive catchphrase for the often observed effect that the use of a psychoactive substance is coupled to an increased probability of the use of further substances.
examples:
nicotine
marijuana
alcohol
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A gateway drug is a term that is commonly used in reference to particular substances that are thought to open the way to using more dangerous or harder drugs such as heroin or cocaine.
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Answer:
The gateway drug effect is a comprehensive catchphrase for the often observed effect that the use of a psychoactive substance is coupled to an increased probability of the use of further substances.
examples:
nicotine
marijuana
alcohol